95 Herculis is a double stellar system in the constellation Hercules, located 432 light-years from Earth.
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| A | |
| Right ascension | 18h 01m 30.40868s[1] |
| Declination | 21° 35′ 44.8121″[1] |
| Apparent magnitude (V) | 4.83±0.01[2] |
| B | |
| Right ascension | 18h 01m 29.96397s[3] |
| Declination | 21° 35′ 43.4043″[3] |
| Apparent magnitude (V) | 5.10[4] |
| Characteristics | |
| A | |
| Evolutionary stage | Giant star[5] or subgiant[2] |
| Spectral type | A2IV[2] |
| B | |
| Evolutionary stage | Giant star |
| Spectral type | G5III[4] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −44.86±3.07[1] km/s |
| Proper motion (μ) | RA: +9.200 mas/yr[1] Dec.: +38.438 mas/yr[1] |
| Parallax (π) | 7.5526 ± 0.0713 mas[1] |
| Distance | 432 ± 4 ly (132 ± 1 pc) |
| B | |
| Radial velocity (Rv) | −32.9±0.12[3] km/s |
| Proper motion (μ) | RA: +8.995 mas/yr[3] Dec.: +36.267 mas/yr[3] |
| Parallax (π) | 7.5492 ± 0.0592 mas[3] |
| Distance | 432 ± 3 ly (132 ± 1 pc) |
| Details[5] | |
| A | |
| Mass | 2.8 M☉ |
| Radius | 6.8 R☉ |
| Luminosity | 167 L☉ |
| Temperature | 8,000 K |
| Rotational velocity (v sin i) | 233 km/s |
| B | |
| Mass | 3.2 M☉ |
| Radius | 19.4 R☉ |
| Luminosity | 167 L☉ |
| Temperature | 4,900 K |
| Rotational velocity (v sin i) | 5.7 km/s |
| Other designations | |
| A: HD 164669, HR 6730, ADS 10993, TIC 424429430, TYC 1566-3674-1 | |
| B: HD 164668, HR 6729, TIC 424429431, TYC 1566-3675-1 | |
| Database references | |
| SIMBAD | data |
| A | |
| SIMBAD | data |
| B | |
| SIMBAD | data |
Characteristics
editFrom the naked eye, 95 Herculis appears as a single star shining at apparent magnitude 4.31. However, when further scrutinized using a telescope, it is revealed to be a double star, with two components separated by 6.3 arcseconds. This system has a color contrast due to the difference of each star's effective temperature.[5]
The brightest component, called 95 Herculis A, is a white giant[6] or subgiant with an apparent magnitude of 4.8.[2] This evolved star has 2.9 times more mass than the Sun, is 6.8 times wider, and is 167 times more luminous. Its effective temperature of 8,000 Kelvin give it a blue-white hue typical of A-type stars. It is spinning rapidly with an projected rotational velocity of 233 km/s.[5]
The secondary is called 95 Herculis B, a yellow giant[6] of apparent magnitude 5.1.[4] It is the most evolved star in the pair, having reached helium burning stage and now converting carbon into oxygen, while 95 Herculis A is still in the transition from hydrogen burning to helium burning.[6] Albeit fainter than 95 Her A, 95 Her B emmits a significant part of its luminosity in the infrared, and hence the bolometric luminosity is 194 times solar. It is 3.2 times more massive than the Sun and 19 times wider. The effective temperature of the star is 4,900 Kelvin.[5]
Orbit
editThe orbital elements 95 Herculis are not accurately known and no orbital motion has been detected. However, they projected separation is calculated at 900 astronomical units, with an orbital period of at least 11,000 years.[5]
See also
editReferences
edit- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d "95 Her A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-09-15.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c "95 Her B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-09-15.
- ^ a b c d e f Kaler, Jim. "95 Herculis". stars.astro.illinois.edu. Retrieved 2024-09-15.
- ^ a b c "95 Herculis". www.havastro.co.uk. Retrieved 2024-09-15.